I've had many games where people ignore objectives just to raise their K/D for gloating rights. It's just a silly number and how it has so much to say about a person is beyond me. In myself I seem to notice the same need to keep my K/D positive when I play Reach. Whenever the game goes bad I get frustrated and oftentimes yell at the TV. 

I'm not much of a fan of COD, it used to be fun. But I got easily bored of it. I like unrealistic games like Halo because it's different and unique, and it stands out more.

Sure sounds like a blast! So far, 4 player co-op is confirmed for this mode.